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The increase of the spin-transfer torque threshold current density in coupled vortex domain walls

Lepadatu, S, Mihai, AP, Claydon, JS, Maccherozzi, F, Dhesi, SS, Kinane, CJ, Langridge, S and Marrows, CH (2012) The increase of the spin-transfer torque threshold current density in coupled vortex domain walls. Journal of Physics: Condensed Matter, 24 (2). 024210 - ? . ISSN 0953-8984

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We have studied the dependence on the domain wall structure of the spin-transfer torque current density threshold for the onset of wall motion in curved, Gd-doped Ni(80)Fe(20) nanowires with no artificial pinning potentials. For single vortex domain walls, for both 10% and 1% Gd-doping concentrations, the threshold current density is inversely proportional to the wire width and significantly lower compared to the threshold current density measured for transverse domain walls. On the other hand for high Gd concentrations and large wire widths, double vortex domain walls are formed which require an increase in the threshold current density compared to single vortex domain walls at the same wire width. We suggest that this is due to the coupling of the vortex cores, which are of opposite chirality, and hence will be acted on by opposing forces arising through the spin-transfer torque effect.

Item Type: Article
Copyright, Publisher and Additional Information: © 2012, Institute of Physics. This is an author produced version of a paper published in Journal of Physics: Condensed Matter. Uploaded in accordance with the publisher's self-archiving policy.
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds)
Depositing User: Symplectic Publications
Date Deposited: 25 Apr 2012 11:28
Last Modified: 11 Jun 2014 12:15
Published Version: http://dx.doi.org/10.1088/0953-8984/24/2/024210
Status: Published
Publisher: Institute of Physics
Identification Number: 10.1088/0953-8984/24/2/024210
URI: http://eprints.whiterose.ac.uk/id/eprint/43877

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